摘要
梯度功能材料的优化设计，可以转化为梯度分布函数的设计。采用幂函数来描述梯度分布，使材料优化问题简化为该幂指数（称为梯度指数）的优化。对梯度功能涂层－基底结构的剥落现象进行了分析，推广了文献［９］的结果，给出了在梯度功能涂层的基底中平行于界面稳态扩展的裂纹的能量释放率和应力强度因子的解析表达式，并由此计算了最优的梯度分布指数。同时，还讨论了梯度功能涂层耐高温抗氧化性能与热应力缓和之间的关系。
The FGM optimization design mainly depends on the design of gradient distribution function (GDF). By considering a power law function as GDF in the analysis, the FGM optimization was simplified to search for the optimum gradient power, i.e ., GP. The spalling analyses and optimization design of functional gradient film/substrate structure are presented in this paper. Energy release rates and stress intensity factors of the substrate crack parallel to the interface were obtained to determine the optimum GP. The relation between the thermal stress relaxation and antithermal or antioxidal properties has also been discussed.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
1998年第4期113-118,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金
关键词
梯度功能涂层
材料优化设计
梯度分布
剥落
functional gradient film/substrate structure, optimization of the materials, gradient distribution, spalling, energy release rates
